Roger Clemens' MVP Baseball was a baseball videogame released in North America during the years of 1991 and 1992 for the NES, Game Boy, Super NES, and Sega Genesis. All bearing then 1991 AL Cy Young Award Winner Roger Clemens' name.
In 1993, the game was released in Japan. The game was only published for Nintendo's Game Boy and Super NES platforms.
The game features 26 teams to use, an exhibition mode and a regular season mode. The game had the ability to "save" your career progress by giving you a password that you could enter at the menu screen, when you wanted to continue the season.
Source: Wikipedia, "Roger Clemens' MVP Baseball", available under the CC-BY-SA License.